Dark energy reconstructions combining baryonic acoustic oscillation data with galaxy clusters and intermediate-redshift catalogs
Luongo O. Muccino M.
1 January 2025EDP Sciences
Astronomy and Astrophysics
2025#693
Context. Cosmological parameters and dark energy (DE) behavior are generally constrained assuming a priori models. Aims. We work out a model-independent reconstruction to bind the key cosmological quantities and the DE evolution. Methods. Through the model-independent Bézier interpolation method, we reconstructed the Hubble rate from the observational Hubble data and derived analytic expressions for the distances of galaxy clusters, type Ia supernovae, and uncorrelated baryonic acoustic oscillation (BAO) data. In view of the discrepancy between Sloan Digital Sky Survey (SDSS) and Dark Energy Spectroscopic Instrument (DESI) BAO data, they were kept separate in two distinct analyses. Correlated BAO data were employed to break the baryonic- dark matter degeneracy. All these interpolations enable us to single out and reconstruct the DE behavior with the redshift z in a totally model-independent way. Results. In both analyses, with SDSS-BAO or DESI-BAO datasets, the constraints agree at a 1- σ confidence level (CL) with the flat ΛCDM model. The Hubble constant tension appears solved in favor of the Planck satellite value. The reconstructed DE behavior exhibits deviations at small z (> 1- σCL), but agrees (< σCL) with the cosmological constant paradigm at larger z. Conclusions. Our method hints at a slowly evolving DE, consistent with a cosmological constant at early times.
Cosmological parameters , Dark energy , Distance scale , Large-scale structure of Universe
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Università di Camerino, Divisione di Fisica, Via Madonna delle carceri 9, Camerino, 62032, Italy
SUNY Polytechnic Institute, Utica, 13502, NY, United States
INAF - Osservatorio Astronomico di Brera, Milano, Italy
INFN, Sezione di Perugia, Perugia, 06123, Italy
Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
Institute of Nuclear Physics, Ibragimova, 1, Almaty, 050032, Kazakhstan
ICRANet, Piazza della Repubblica 10, Pescara, 65122, Italy
Università di Camerino
SUNY Polytechnic Institute
INAF - Osservatorio Astronomico di Brera
INFN
Al-Farabi Kazakh National University
Institute of Nuclear Physics
ICRANet
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026